/*
* Copyright 2014 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.kuujo.vertigo.cluster.manager.impl;
import java.util.HashSet;
import java.util.Set;
import net.kuujo.vertigo.util.ContextManager;
import org.vertx.java.core.Handler;
import org.vertx.java.core.Vertx;
import com.hazelcast.core.HazelcastInstance;
import com.hazelcast.core.MemberAttributeEvent;
import com.hazelcast.core.MembershipEvent;
import com.hazelcast.core.MembershipListener;
/**
* Hazelcast cluster membership listener.
*
* @author <a href="http://github.com/kuujo">Jordan Halterman</a>
*/
class HazelcastClusterListener implements ClusterListener, MembershipListener {
private final String nodeID;
private final ContextManager context;
private final Set<Handler<String>> joinHandlers = new HashSet<>();
private final Set<Handler<String>> leaveHandlers = new HashSet<>();
public HazelcastClusterListener(HazelcastInstance hazelcast, Vertx vertx) {
this.nodeID = hazelcast.getCluster().getLocalMember().getUuid();
this.context = new ContextManager(vertx);
hazelcast.getCluster().addMembershipListener(this);
}
@Override
public String nodeId() {
return nodeID;
}
@Override
public void registerJoinHandler(Handler<String> handler) {
joinHandlers.add(handler);
}
@Override
public void unregisterJoinHandler(Handler<String> handler) {
joinHandlers.remove(handler);
}
@Override
public void registerLeaveHandler(Handler<String> handler) {
leaveHandlers.add(handler);
}
@Override
public void unregisterLeaveHandler(Handler<String> handler) {
leaveHandlers.remove(handler);
}
@Override
public void memberAdded(final MembershipEvent event) {
// This method will be called from the Hazelcast context so we have
// to make sure we call Vert.x handlers on the proper context.
for (final Handler<String> handler : joinHandlers) {
context.run(new Runnable() {
@Override
public void run() {
handler.handle(event.getMember().getUuid());
}
});
}
}
@Override
public void memberAttributeChanged(MemberAttributeEvent event) {
// Do nothing.
}
@Override
public void memberRemoved(final MembershipEvent event) {
// This method will be called from the Hazelcast context so we have
// to make sure we call Vert.x handlers on the proper context.
for (final Handler<String> handler : leaveHandlers) {
context.run(new Runnable() {
@Override
public void run() {
handler.handle(event.getMember().getUuid());
}
});
}
}
}